Propeller



June 2, 1925.` 1,540,728

w. G. G. 'WEIDINGER PROPELLER Filed Spt. 6. 1924 AMM/555:'

wmf/V70@ y Y @fW Patented June 2, 1925.

UNITED STATES PATENT OFFICE.

PROPELLER.

Application iled September 6, 1924. Serial No. 736,279.

To all who-m it may concern.:

Be it known that I, VILLIAM G. G. IVEI- D INGER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Propellers, of which the following is a specificatiorp 4 This invention relates to improvements in propellers for aerial use although it is capable of other adaptations if desired. One object is to provide a more economical application of power and to increase the etticiency of the propeller by giving itI an increased grip on the medium in which it operates. A further object is to provide a high speed propeller that operates without loss of power, that is simple in construction, of few parts, and that consequently is cheap to manufacture.

With the foregoing and other objects in View the invention consists in the combination and arrangement of parts to be hereinafter fully described, pointed out in theappended claims and illustrated in the accompanying drawing which forms a partof this application and in which- Fig. 1 isaview of the propeller in front elevation.

Fig. 2 is a view of the propeller in side elevation.

Fig. 3 is a sectional view on line 3 3 of Fig. 1.

Fig. 4 is a view `of the propeller in rear elevation.

Fig. 5 is an enlarged fragmentary sectional view of the propeller.

Like reference characters denote corresponding parts throughout the several views.

The reference numeral 1 denotes the tubular shaft which fits into a. recess in the hub 2 and is positively retained in operative position by means of the headless screw 3.

Secured to or formed integral w'th the hub 2 are the blades 4, of counterpart formation, four in number in this instance although this is not strictly essential, said blades curving outwardly and rearwardly from said hub and being spaced equidistant one from the other thereabout.

Each blade curves uniformly out from the hub, as it extends rearwardly therefrom, and then inwardly and terminates in the plane of said member. The propeller rotates to the right and each blade is formed with three cutting edges 5, 6, 7 which come together in a point 8 at the blade termination. Each blade comprises a concave portion 9 that grips the air as it rotates and a convex portion 1() that embraces the cutting edge 5 and that extends in a stream line from the hub to the free or pointed end of the blade and affords the minimum air resistance. The

propeller in operation penetrates the air screw-fashion, the concave portion of the blades accentuating the forward thrust of the propeller and the convex portions affording but a trilling resistance to the air.

l-Vhat is claimed is y 1. In a propeller, a shaft, a hub arranged thereupon, and blades spacedn equidistant one from the other about said hub and extendving outwardly and then inwardly and terminating in the plane of said hub, each of said blades being formed with three cutting edges and with a concave portion.

2. In a propeller, a shaft, a hub screwed thereupon to rotate therewith, and blades of counterpart formation spaced equidistant one from the other about said hub and curving uniformly outward and then inward and terminating in the plane of said hub, each of said blades being formed with three cutting edges terminating in a point, and with a -concave portion.

3. In a propeller, a tubular shaft, a hub fast thereupon and rotating therewith, and blades of counterpart formation spaced equidistant one Ifrom the other about said hub and extending rearwardly therefrom, said blades curving uniformly outward and then inward and terminating in the plane of said hub, each of said blades being formed with three long1tudinally extending cutting edges terminating in a point at the blade end. with a concave portion and with a convex portion embracing one of said cutting edges and producing a streamline effect.

In testimony that I'claim the foregoing as my own I have hereto affixed my signa- 1 ture 1n the presence of two subscribing witnesses. A

VILLIM G. G. VEIDINGER.

lVitnesses F. S. MANN, ARTHUR W. RUAL.

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